The Mechanism behind Vibration Assisted Fluidization of Cohesive Micro-Silica
Rens Kamphorst (TU Delft - Applied Sciences)
P. Christian van der Sande (TU Delft - Applied Sciences)
Kaiqiao Wu (TU Delft - Applied Sciences)
Evert C. Wagner (TU Delft - Applied Sciences)
M. Kristen David (TU Delft - Applied Sciences)
Gabrie M.H. Meesters (TU Delft - Applied Sciences)
J. Ruud van Ommen (TU Delft - Applied Sciences)
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Abstract
Vibro-assisted fluidization of cohesive micro-silica has been studied by means of X-ray imaging, pressure drop measurements, and off-line determination of the agglomerate size. Pressure drop and bed height development could be explained by observable phenomena taking place in the bed; slugging, channeling, fluidization or densification. It was observed that channeling is the main cause of poor fluidization of the micro-silica, resulting in poor gas-solid contact and little internal mixing. Improvement in fluidization upon starting the mechanical vibration was achieved by disrupting the channels. Agglomerate sizes were found to not significantly change during experiments.
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